METHOD FOR WORKING SHEET-LIKE STEEP DEPOSITS

摘要

A method for working sheet-like ore bodies consists in that haulage orts are driven from haulage gate to laying side of the deposit. At level 8-10 m higher that haulage horizon, from collection drift to footwall of deposit, one penetrates drilling ort. Stock of the block placed above the drilling ort is drilled with inclined hole rings drilled therefrom at angle equal to dip angle. Pillar between the haulage and drilling orts is drilled with vertical rings of rod holes drilled from haulage orts. Near the footwall of the deposit one performs loose cutting of block stock, thereafter one performs breaking of mineral in direction from footwall to hanging wall by inclined layers with thickness of 5-7 m through breaking of deep hole rings to compressed medium. Delay of pillar working over haulage orts by value L is regulated by breaking rod holes.